内蒙古西河盆地新近纪“红土”记录的沉积环境

笔者从岩性地层、孢粉组合、地层对比等方面,对西河盆地红层的地层时代与沉积环境,进行深入的研究和探讨并追朔其地质演化历程。本区首次发现的孢粉组合是以草本植物蒿属为优势种,松、胡桃及禾本科为次优势种的疏林灌丛草原,其中胡桃属、榆属为典型的古—新近纪属种。根据岩性特征及生物特征综合分析研究,认为西河盆地“红土”地层属于新近系上新统宝格达拉组（N2b）,地层层序类型在平面上体现出从盆地边缘到中心沉积环境由河流、冲积扇、三角洲到湖泊的变化规律。

Sedimentary environment of Neogene laterite records in the Xihe basin, Inner Mongolia

The stratigraphic age and sedimentary environment of the laterite bed in the Xihe basin have been studied in detail in the contexts of lithology, sporo-pollen assemblages and stratigraphic correlation and the geological evolution process during that time has been traced. The sporo-pollen assemblage in this area is the veld whose dominant elements are herbaceous Artemisia and subordinate elements are Pinus, Juglans and Graminae, of which Juglans and Ulmus are typical Paleogene-Neogene genera and species. Bas...